//C06:6.9 boolean.c
#include <stdio.h>
int main(void)
{
    long num;
    long sum = 0L;
    _Bool input_is_good;
    printf("Please enter an integer to be summed. ");
    printf("(q to quit): ");

    input_is_good = (scanf("%ld", &num));
    while(input_is_good)
    {
        sum = sum + num;
        printf("Please enter an integer to be summed. ");
        input_is_good = (scanf("%ld", &num) == 1);       
    }
    printf("Those integers sum to %ld.\n", sum);
}
